Someone

// Returns a random vehicle ID
public PickRandomVehicle( )
{
	for( new i = 1; i <= NumberOfInGameVehicles; i++ )
	{
		if( !AnyPlayerInVehicle( i ) )
		{
			return vehicleID;
		}
	}

	return -1; // No vehicles available
}


public AnyPlayerInVehicle( vehicleID )
{
	for( new i = 0; i < MAX_PLAYERS; i++ )
	{
		if( IsPlayerConnected( i ) && GetPlayerVehicleID == vehicleID )
		{
			return 1;
		}
	}

	return 0;
}